Malicious PDF — malware analysis report

Static analysis result for SHA-256 766ae3c727fe3b26…

MALICIOUS

PDF

35.0 KB Created: 2020-05-15 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db3ba5e765886b418f1119e61c7e1a0 SHA-1: 6e47f0d6f6d117c9b01103976dfe1afeb58a31d1 SHA-256: 766ae3c727fe3b26c2744677f832f4682ccf76a5812e5a1d46b3ffe5c6d0b72d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes URLs that are also listed in the extracted URLs, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://naturesbarnyard.com/uploads/1/3/0/6/130604532/130604532.html#marketing+plan+example+template
    • http://thetrischettigroup.net/uploads/1/3/0/9/130969831/6855557.pdf
    • http://bakingwitmarc.com/uploads/1/3/0/5/130551127/gaborile.pdf
    • http://wordsmith-sg.com/uploads/1/3/1/6/131606954/nikujawi.pdf
    • http://aclimited.org/uploads/1/3/1/6/131637714/munaj.pdf
    • http://gerilify.com/uploads/1/3/0/3/130379517/xipikewasu.pdf
    • http://timemanagement.guru/uploads/1/3/1/0/131071175/tinaborumin.pdf
    • http://singlesnudistgroup.com/uploads/1/3/0/5/130542971/sigezuwibo.pdf
    • http://resourcefulmaven.com/uploads/1/3/1/6/131637219/rupor.pdf
    • http://handsforhealthhomecare.org/uploads/1/3/0/5/130589121/gefipividexof-lutujaxuv-nefes-zeruf.pdf
    • http://kvffa.org/uploads/1/3/1/6/131636914/2273964.pdf
    • http://herkeseegitim.org/uploads/1/3/0/7/130775203/1729e.pdf
    • http://chestercanoehire.com/uploads/1/3/0/8/130814241/86e0742f1b.pdf
    • http://calendarservicesma.com/uploads/1/3/0/5/130539553/5762709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc5.bin
c6ae35c6f9483a540d52536e52943267176dd68443d65b7a539acb44ef93abc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 9656 bytes

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